Resumable hashlib: a picklable interface to CPython's OpenSSL-based hashlib standard library

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  • License: Apache Software License (Apache Software License)
  • Author: Andrey Kislyuk
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Project description

Rehash is a resumable interface to the OpenSSL-based hashers (message digest objects) in the CPython hashlib standard library. Rehash provides hashers that can be pickled, persisted and reconstituted from their repr(), and otherwise serialized. The rest of the Rehash API is identical to hashlib.

Rehash hashers can be used to checkpoint and restore progress when hashing large byte streams:

import pickle, rehash
hasher = rehash.sha256(b"foo")
state = pickle.dumps(hasher)

hasher2 = pickle.loads(state)
hasher2.update(b"bar")

assert hasher2.hexdigest() == rehash.sha256(b"foobar").hexdigest()

Installation

pip install rehash

Applications

Rehash is useful in any situation when your VM is short-lived or preemptible, and the object you’re hashing is huge. For example, Rehash can be used to hand off the hashing state of large objects between AWS Lambda functions or Google Cloud Functions, which have runtime limits of 15 and 9 minutes, respectively.

License

Licensed under the terms of the Apache License, Version 2.0.

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